CVE-2026-53269
MediumExploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
W jądrze Linuxa wykryto podatność w mechanizmie synproxy, która wynika z braku synchronizacji przy rejestracji hooków netfilter na żądanie. Gdy wielu użytkowników jednocześnie dodaje pierwsze reguły iptables lub wyrażenia nftables, może dojść do wyścigu (race condition) w inkrementacji licznika referencji. Dodano mutex, który serializuje dostęp do bloków sterujących licznikiem referencji z obu frontendów.
Risk Assessment
Wyścig w liczniku referencji może prowadzić do nieprawidłowego zarządzania hookami netfilter, co potencjalnie umożliwia pominięcie reguł SYN proxy lub destabilizację stosu sieciowego. Organizacja ryzykuje przerwanie ochrony przed atakami SYN flood lub awarię systemu.
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